Question: 2 Write the formulae of the following:
i) Mercurous oxide
ii) Stannic bromide
iii) Ammonium acetate
iv) Potassium permanganate
v) Aluminium nitride
Show crisscross method of the above and answer​

b is the correct

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.